koralia 3

hey all got a quick ?. A friend of mine gave me three new koralia 3 powerheads as he got a vortex and wasn't going to use them anymore. My question is where do I place these in my tank for optimum flow? I have a 55 galon 4 foot long tank. I know this is subjective but just wanted all you input.

I finally ditched the Maxi Jet 1200s today. I installed a Koralia 3 on each end of my tank. For those of you who use these, do you use the flow concentrator with the fish guard or not? I ask because the front of the powerhead is more open then what I have been used to and I don't want any of my...

I have bought two coralia 3 pump but only one of them is making so much movement in the tank that I'm going to be keeping only one or maybe even get #2 , if anyone is interest about the other let me know. It hasn't been opened yet.. I'll sell it for $30 + shipping (about $5.00 I think)...